[1] Web Applications 1.0 r7502 Provide a way for authors to broadcast to many ports without memory leaks. ( (2012-11-03 07:32:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=7501&to=7502

[2] [whatwg] Define MessagePort.isConnected or MessagePort.ondisconnect ( (2012-11-03 07:40:59 +09:00 版)) http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2012-November/037774.html

[3] Web Applications 1.0 r7502 Provide a way for authors to broadcast to many ports without memory leaks. ( (2012-11-03 07:32:00 +09:00 版)) https://html5.org/r/7502

[4] Fix #194: remove PortCollection in favor of advice · whatwg/html@5804d8c (2015-09-30 20:48:08 +09:00 版) https://github.com/whatwg/html/commit/5804d8c3d17fe8e9c9b486082a8ea498dce638e9